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- #include <iostream>
- #include <fstream>
- using namespace std;
- int prime (int a)
- {
- int ok=1;
- for(int i=2;i<=a/2;i++)
- if(a%i==0) ok=0;
- return ok;
- }
- int main()
- {
- int a[100][100],n,s=0;
- ifstream fin("mat.in");
- fin>>n;
- for(int i=1;i<=n;i++)
- for(int j=1;j<=n;j++)
- fin>>a[i][j];
- for(int i=1;i<=n;i++)
- for(int j=1;j<=n;j++)
- if(j>i && prime(a[i][j])==1) s+=a[i][j];
- cout<<s;
- return 0;
- }
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